F/5.6, 1/125, ISO 320.
Why did the teacher jump into the water?
She wanted to test the water!
Interesting Fact: The black knob at the base of the male Mute Swan’s bill swells during the breeding season and becomes noticeably larger than the female’s. The rest of the year the difference between the sexes is not obvious. ( https://www.allaboutbirds.org/guide/Mute_Swan/lifehistory )